EP1127674A2 - Procédé et dispositif pour mouler par injection des pièces comportant au moins une partie creuse - Google Patents

Procédé et dispositif pour mouler par injection des pièces comportant au moins une partie creuse Download PDF

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Publication number
EP1127674A2
EP1127674A2 EP01103313A EP01103313A EP1127674A2 EP 1127674 A2 EP1127674 A2 EP 1127674A2 EP 01103313 A EP01103313 A EP 01103313A EP 01103313 A EP01103313 A EP 01103313A EP 1127674 A2 EP1127674 A2 EP 1127674A2
Authority
EP
European Patent Office
Prior art keywords
cavity
liquid
plastic material
injection
melt
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP01103313A
Other languages
German (de)
English (en)
Other versions
EP1127674A3 (fr
EP1127674B1 (fr
Inventor
Helmut Dipl-Ing. Eckardt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Battenfeld GmbH
Original Assignee
Battenfeld GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Battenfeld GmbH filed Critical Battenfeld GmbH
Publication of EP1127674A2 publication Critical patent/EP1127674A2/fr
Publication of EP1127674A3 publication Critical patent/EP1127674A3/fr
Application granted granted Critical
Publication of EP1127674B1 publication Critical patent/EP1127674B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/1703—Introducing an auxiliary fluid into the mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/1703—Introducing an auxiliary fluid into the mould
    • B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/1703—Introducing an auxiliary fluid into the mould
    • B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
    • B29C45/1711—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles and removing excess material from the mould cavity by the introduced fluid, e.g. to an overflow cavity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/1703—Introducing an auxiliary fluid into the mould
    • B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
    • B29C45/1706—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles using particular fluids or fluid generating substances
    • B29C2045/1707—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles using particular fluids or fluid generating substances using a liquid, e.g. water
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/1703—Introducing an auxiliary fluid into the mould
    • B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
    • B29C45/1706—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles using particular fluids or fluid generating substances
    • B29C2045/1707—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles using particular fluids or fluid generating substances using a liquid, e.g. water
    • B29C2045/1708—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles using particular fluids or fluid generating substances using a liquid, e.g. water removing the liquid from the hollow
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/1703—Introducing an auxiliary fluid into the mould
    • B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
    • B29C45/1706—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles using particular fluids or fluid generating substances
    • B29C2045/1709—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles using particular fluids or fluid generating substances using a cooling fluid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/1703—Introducing an auxiliary fluid into the mould
    • B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
    • B29C45/1711—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles and removing excess material from the mould cavity by the introduced fluid, e.g. to an overflow cavity
    • B29C2045/1712—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles and removing excess material from the mould cavity by the introduced fluid, e.g. to an overflow cavity plastic material flowing back into the injection unit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/1703—Introducing an auxiliary fluid into the mould
    • B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
    • B29C2045/1727—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles using short shots of moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles

Definitions

  • the invention further relates to a device for injection molding of at least one cavity having molded parts made of thermoplastic Plastic material.
  • the generic method is the gas internal pressure method at Manufacture of molded parts made of thermoplastic material known and widespread. Such a method is known from, for example US 4,101,617. It is in the still molten plastic melt a fluid is introduced under pressure. By so inside The pressure generated by the melt will melt against the cavity wall the injection mold pressed; Sink marks due to volume contraction when cooling down are avoided.
  • Nitrogen gas As a fluid, which is injected into the melt under pressure, is commonly used Nitrogen gas used. It has the advantage of being inert Gas does not undergo any chemical reaction in the hot melt. there the disadvantage is accepted that the nitrogen is usually quite is expensive to manufacture. Either the injection molding device has to Nitrogen can be supplied from bottles or the gas is on site - at Greater gas demand - obtained by means of molecular filters.
  • EP 0 400 308 B1 proposes after gas injection into the melt the gas can escape at a point away from the injection point allow; then a circulation of the gas through the created cavity. There is a cooler in the gas circuit integrated. This is supposed to accelerate the cooling process of the melt take place because cooled gas is fed in a closed circuit becomes.
  • the invention is therefore based on the object of further developing the injection molding process of the generic type in such a way that the disadvantages mentioned are avoided.
  • the method and the associated device should therefore make it possible to do without the use of expensive nitrogen.
  • the shortest possible cooling time should be realizable, which significantly shortens the injection molding process.
  • the method is also intended to ensure that the flow of the melt into the injection mold is as homogeneous as possible, so that changeover markings can be avoided as far as possible.
  • the main idea of the invention is based on the fact that in the Melt to be injected fluid a liquid with high heat capacity is used, in connection with the partial filling of the cavity can be achieved that first an efficient use of Plastic material is made.
  • By partially filling the cavity with Melt in combination with the use of high liquid Heat capacity is achieved that a quick cooling process takes place, so that the cycle time of the injection molding cycle is reduced significantly can be. It has surprisingly been found that by the characteristics mentioned hardly occur flow marks that otherwise to fear and observe in the case of the internal gas pressure process are. This is due to the comparable viscosity of the liquid melt returned with the injected liquid of high heat capacity.
  • a part of the still molten plastic material from the cavity (5) into a demoldable secondary cavity (8) is ousted.
  • the flow of plastic material from the cavity (5) in the secondary cavity (8) is preferably controlled by valve means (9), which are opened or closed according to the time schedule. This is a targeted influence on the overflow of the melt possible from the main to the secondary cavity.
  • the liquid can flow along the melt flow path (4) through the sprue area (11) are injected into the cavity (5) or alternatively for this purpose directly into the cavity (5) by means of an injection nozzle (10).
  • a further improvement in the flow behavior of the melt or Control of this behavior arises if, before the injection of the thermoplastic melt in the cavity (5) opposite one the ambient pressure is increased by introducing a gas is built up.
  • This gas pressure can be reduced during step b) above. only gradually be dismantled.
  • the reduction in gas pressure can be in Dependent on being controlled or regulated, such as the injection pressure the liquid increases during its injection.
  • the liquid before it is injected into the still molten plastic material is tempered.
  • the Liquid is cooled to a predetermined temperature range.
  • a temperature range between 0 ° C. is particularly advantageous and 20 ° C, preferably between 4 ° C and 15 ° C, provided. It can but may also be necessary, for example in the case of materials shock-like cooling will damage the liquid on you to heat the specified temperature range.
  • a temperature range between 20 ° C and 150 ° C is preferred between 40 ° C and 100 ° C.
  • the following process step is carried out after allowing to cool and before demolding: c ') Pressing in compressed gas, preferably compressed air, along the path by which the liquid was injected into the plastic material, and blowing the liquid out of the cavity (1) of the molded part (2) at at least one blow-out point (12) a location that is distant from the fluid entry location.
  • compressed gas preferably compressed air
  • the blow-out point (12) is preferred in the region of the end of the flow path arranged of the plastic material.
  • the following process step is carried out at the time mentioned: c ") pressing in compressed gas, preferably compressed air, at a gas input point which is distant from the point at which the liquid was injected into the plastic material, and blowing out the liquid from the cavity (1) of the molded part (2) via the point, where the liquid was injected into the plastic material.
  • compressed gas preferably compressed air
  • the liquid can also be sucked out. It is then provided that the following process step is carried out: c ''') Applying a vacuum at a location fluidically connected to the liquid-filled cavity (1) in order to suck the liquid in the cavity (1) out of the cavity (1).
  • the vacuum is advantageously applied to the injection nozzle (10) for liquid created.
  • the molding process during the injection of melt and of liquid as well as during the curing of the material corresponding control or regulation of the media pressures is influenced favorably become. It is therefore advantageously provided that on the liquid introduced into the plastic melt during the above Steps b) and / or c) a pressure is exerted according to a predetermined Time profile is regulated or controlled.
  • the pressure profile can regulated according to a pulsating ascending and descending course or be controlled; is above all one at a sinusoidal predetermined constant pressure value running pressure curve thought.
  • the pressure in a first time phase at a first, preferably constant, level and in a later, second time phase on a second, preferably constant, level is regulated or controlled, the first pressure level is lower than the second.
  • Water or oil is preferred as the liquid with high heat capacity in question.
  • the device is characterized by means (13) to remove, in particular suction, the in the cavity (1) of the Shaped part (2) located fluid, the fluid having a liquid is high heat capacity.
  • the means (13) is a nozzle through which the liquid from the Cavity (1) can be blown out.
  • the remedy is one Device for generating a vacuum, which is connected to the means (10) for Injecting the liquid can be connected.
  • the device is a Injection element (14) with which either liquid (W) or Gas (G) into the cavity (5) of the injection mold (6) are entered can.
  • the injection element therefore has a switchover option from one medium to another.
  • Fig. List an injection molding device can be seen, the one injection unit 3, which produces plastic melt in the usual way and in injects an injection mold 6.
  • the tool 6 has a cavity 5 with a cavity wall 7.
  • the plastic melt is along a melt flow path 4 from the injection unit 3 into the tool 6 sprayed.
  • the molded part 2 to be produced has a cavity 1, on the one hand makes the part lighter and requires less material, which it on the other hand, allows in while cooling the melt the cavity 5, this is pressed against the cavity wall 7.
  • the produced Molded parts 2 therefore have a particularly good surface quality.
  • the overflow can be controlled or regulated by valve means 9.
  • the fluid is injected via the injection nozzle 10. As can be seen, the fluid therefore spreads along the melt flow path 4 in the direction of the cavity 5.
  • a fluid with a high thermal capacity comes as the fluid for use.
  • the cavity 5 is initially partial before the liquid is injected filled, it has been shown to be advantageous that they are not with more than 80% of their volume is filled. Then the liquid preferably water, injected. By tempering the liquid, namely by cooling to a value between 4 ° C and 15 ° C, can be achieved that a very fast curing of the Plastic melt takes place, whereby it is sufficient, the plastic material to cool in such a way that it is self-supporting.
  • Fig. 1 it can be seen that the input of the liquid along the Melt flow path 4 takes place in the region of the sprue 11.
  • the more detailed Design of the area of the injection mold is in the Figures 2 and 3 reproduced.
  • melt S is in the gate 11 in the Cavity 5 injected.
  • the melt flows, as already mentioned above at the end of the flow path from the main cavity 5 into the secondary cavity 8, the overflow being regulated by means of valve means 9. After this at least partially curing must be the liquid that the Fills cavity 1, can be removed from this. To do this Compressed air is introduced into the liquid 10 injector.
  • the cavity 1 extends over the Cavity 5 out into the secondary cavity, which is due to the input of liquid into the melt.
  • a blow-out nozzle 13 positioned in the area of the overflow cavity 8, namely at the blow-out point 12 for liquid.
  • By injecting compressed air through the nozzle 10 All liquid can be blown out of the cavity 1 again. It is driven out by the blow-out nozzle 13. It can be - more supportive Way - a vacuum is applied to the blow-out nozzle 13.
  • the liquid can also be blown out if is worked without overflow, which is illustrated in Fig. 3.
  • Fig. 4 it can be seen that a special device advantageous embodiment results when an injection element 14 is used through which either liquid (water) W or compressed air (Gas) G can be injected. 4, the injector 10 is sufficient for liquid and gas in the area of the melt flow path 4 from the injection unit 3 into the mold cavity.
  • the combined injection element 14 for liquid and Arrange gas in such a way that liquid or Gas is injected directly into the cavity of the tool.
  • the method described above can also be used advantageously for otherwise use the usual injection molding process.
  • it can also be used well if the molded part consists of more than one Plastic component is injected (2-component process).
  • the liquid can also be fed into the sprue distributor take place, whereby several partial cavities are supplied with liquid can.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
EP01103313A 2000-02-22 2001-02-13 Procédé pour mouler par injection des pièces comportant au moins une partie creuse Expired - Lifetime EP1127674B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10007994 2000-02-22
DE10007994A DE10007994C2 (de) 2000-02-22 2000-02-22 Verfahren und Vorrichtung zum Spritzgiessen von mindestens einen Hohlraum aufweisenden Formteilen

Publications (3)

Publication Number Publication Date
EP1127674A2 true EP1127674A2 (fr) 2001-08-29
EP1127674A3 EP1127674A3 (fr) 2002-02-06
EP1127674B1 EP1127674B1 (fr) 2003-11-05

Family

ID=7631801

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01103313A Expired - Lifetime EP1127674B1 (fr) 2000-02-22 2001-02-13 Procédé pour mouler par injection des pièces comportant au moins une partie creuse

Country Status (6)

Country Link
US (1) US6713014B2 (fr)
EP (1) EP1127674B1 (fr)
JP (1) JP4741095B2 (fr)
AT (1) ATE253442T1 (fr)
DE (2) DE10007994C2 (fr)
ES (1) ES2210044T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2474405A1 (fr) * 2011-01-11 2012-07-11 Linde Aktiengesellschaft Procédé de pression interne de gaz pour la fabrication de pièces en plastique

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GB2389069B (en) * 1999-07-17 2004-05-12 Univ Warwick Gas injection moulding method and apparatus
US6716387B2 (en) * 2001-02-28 2004-04-06 Alliance Systems, Inc. Process for pressure assisted molding of hollow articles
GB0314451D0 (en) * 2003-06-20 2003-07-23 Cinpres Gas Injection Ltd Liquid assisted moulding method and apparatus
DE102004017387A1 (de) * 2004-04-05 2005-10-20 Lothar Kallien Verfahren zur Herstellung von Gussteilen
DE102004020579A1 (de) * 2004-04-27 2005-12-01 Mekra Lang Gmbh & Co. Kg Verfahren zum Herstellen von Spritzgussformteilen, insbesondere von Teilen von Kraftfahrzeugspiegeln
JP4777667B2 (ja) * 2005-02-07 2011-09-21 株式会社シスコ 金型の加熱冷却システム及び中空射出成形品用の金型装置
KR101703888B1 (ko) * 2015-09-24 2017-02-07 주식회사 유도 수지의 난류 유동장치가 구비된 핫런너 시스템
EP3558622B1 (fr) * 2016-12-21 2021-04-28 Sapa S.P.A. Méthode de moulage par injection de pièces creuses intérieures
IT201800002428A1 (it) 2018-02-06 2019-08-06 Sapa S P A Macchinario e metodo di stampaggio a iniezione di elementi cavi

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DE10007994A1 (de) 2001-09-06
US20010017433A1 (en) 2001-08-30
ES2210044T3 (es) 2004-07-01
JP4741095B2 (ja) 2011-08-03
JP2001232656A (ja) 2001-08-28
EP1127674A3 (fr) 2002-02-06
US6713014B2 (en) 2004-03-30
ATE253442T1 (de) 2003-11-15
DE10007994C2 (de) 2003-11-13
DE50100886D1 (de) 2003-12-11
EP1127674B1 (fr) 2003-11-05

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